JPH09106210A - Fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove offset toner in accordance with a change in the offset toner amount, in the case of changing the ad justment target value of the surface temperature of a fixing roller and changing the gloss of an image. SOLUTION: As for the device provided with the fixing roller 1, a temperature control means for keeping the surface temperature of the roller at the prescribed temperature based on the detection temperature of temperature detecting element 4 and 4' for detecting the temperature of the roller surface, an oil applying means 12 for applying the oil on the surface of the fixing roller, and a cleaning web 7 for removing the offset toner from the fixing roller after the end of the fixing operation, and for fixing a multicolor and multilayered, or monochromatic unfixed developer image on a recording material at a press- contact part between the fixing roller 1 and the pressure roller 2 and also provided with plural image gloss modes capable of switching the glossiness of the output image, the amount of winding the cleaning web 7 is changed based on the temperature adjustment target value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color or monochromatic fixing device in an image forming apparatus such as an electrophotographic apparatus.

[0002]

2. Description of the Related Art To form a color image on a recording material by superposing toner images of a plurality of colors, an electrostatic latent image is formed on an image carrier, and the electrostatic latent image is successively developed with toner. A method of transferring to a recording material each time and superimposing color toner images of a plurality of colors on the recording material, or a method of superimposing a plurality of color toner images on an image carrier or an intermediate recording material and collectively recording them. There is a method of transferring on top.

Of these, the former method is the German Patent DE
It has been put to practical use with the configuration described in JP 2607727 A, JP 50-50935 A, and the like. On the other hand, the latter method has problems such as color mixing at the time of development and image deterioration due to retransfer, but it has advantages such as a simple structure, and is a technique that is currently attracting attention. In either method, finally, as shown in FIG. 6, the toner images T of a plurality of colors formed on the recording material 3 are heat-fixed to mix the toner images of the respective colors to obtain a full-color image. Is something that can be done.

An example of this type of fixing device of the heat roller type will be described below with reference to FIG. In FIG. 5, 51
Is a fixing roller for melting and fixing the toner T on the recording material 53 by heating and pressing, and 52 is a pressing roller for pressing. Usually, the fixing roller 51 is often heated from the inner surface using a heater 54 such as a halogen lamp. Therefore, the surface temperature of the fixing roller 51 is monitored by the temperature detecting element 64 such as a thermistor, and the heater 54
It is common to control the temperature by controlling the on / off of. As the color toner T, four colors of yellow, cyan, magenta, and black toner are generally used.

In the case of fixing the color toner T, unlike the case of ordinary black-and-white printing, not only the fixing property but also the melt-mixing property of each color is an important factor for proper color reproduction. Therefore, the color toner T is formulated not only for chromatic colors but also for black toner so that the melting point thereof is slightly lower than that of the black and white toner of a black and white copying machine which is generally used. For example, a method of shifting the molecular weight of a material such as styrene-acrylic resin or polyester used as a binder resin to a low molecular weight side, or a method of blending a wax having a low melting point as a release agent is used. Therefore, the fixing roller 51 is much more likely to be offset than the case where the fixing is performed with the black toner used in a normal black-and-white copying machine or printer.

Therefore, in order to prevent offset, as shown in FIG. 5, the oil applying device 55 and the cleaning web 7 are provided.
A configuration is generally used in which an oil 56 such as silicone oil is applied to the surface of the fixing roller 51 by using the above. Further, in order to improve the above-mentioned color mixing property, the low melting point toner is fused and fixed at a fixing temperature slightly higher than the fixing possible temperature so that the toners of respective colors are sufficiently dissolved and mixed, and the surface of the fixing roller 51 is also fixed. As shown in FIG. 6, the surface of a core metal 60 such as Al is covered with a silicone rubber 59 (HTV or the like) having excellent elasticity and strength, and the surface thereof has excellent releasability and flexibility. (L
In many cases, the device is covered with a TV or the like) to improve the heat conduction efficiency by enclosing the toner. Further, the pressure roller 52 also has a silicone rubber 62 (HTV) having a proper elasticity on the surface of the core metal 63 such as Al.
Etc.) and the surface thereof is coated with a silicone rubber 61 (LTV or the like) having excellent releasability and flexibility, so that the releasability to toner is improved.

Of course, the above structure may change depending on the type of the release agent oil. For example, when methyl phenyl type silicone oil is used as the oil, the above configuration can be used. However, when dimethyl silicone oil is used, a swelling prevention is further performed between the silicone rubbers 59 and 60 of the fixing roller 51. A blocking layer may be provided.

In any case, in the conventional device as described above,
As described above, a toner is prepared with a low-molecular weight binder or a low-melting wax having a melting point generally represented by a glass transition point or a melt viscosity generally represented by a melting index, and each color is sufficiently mixed. By carrying out heat fixing as described above, a good full-color image was formed.

On the other hand, after the fixing, the surface of the toner image is smoothed, and the wax, which is a releasing agent, appears on the surface, so that an image having a high glossiness (usually using a gloss value) is easily obtained. Also, offset due to heat is likely to occur, and in order to prevent this, it is necessary to apply a large amount of a release agent such as silicone oil to the fixing roller as described above, so the glossiness of the toner is further increased and the fixing device is also It was easy to be contaminated with oil. In particular, in recent years, as color copiers have become more popular in the general public, the same device may copy not only full-color images but also mono-color and black-and-white images. The plain paper had a so-called calendar-like image with a higher gloss than the normal black and white copy.

Therefore, in order to adjust the glossiness, a structure for changing the temperature adjustment target value is generally used. The target temperature adjustment value is set higher than the standard value when outputting an image with high gloss, and the target temperature adjustment value is set lower than the standard value when outputting an image with low gloss. Therefore, documents created by word processors and computers,
Applications for outputting high-quality original prints using color laser beam printers and the like are rapidly increasing. However, images with strong gloss as described above are output as images with low gloss as black and white documents for office use. In addition, the graphic image can be output as an image having a higher glossiness. In the printer field where not only full-color printing but also high-quality black-and-white printed images are required, the glossiness can be adjusted to satisfy full-color printing as well as black-and-white printing with color laser beam printers. Forming an image that can.

[0011]

However, by setting the temperature control target value to a high value in order to output a highly glossy image, the above-described heat-induced offset is more likely to occur, and the conventional cleaning web is There is a drawback that the offset toner cannot be collected with the winding amount and the image is stained by the slipped-off offset toner. Further, there is a drawback that the fixing roller is scraped off by the offset toner accumulated on the cleaning web, or the cleaning web sticks to the fixing roller and winds up when the fixing roller is cold.

The present invention has been made to solve the above-mentioned conventional problems, and can prevent offset in a color image forming apparatus capable of adjusting the glossiness of an image and prevent the cleaning web from wrapping. And to provide a highly efficient fixing device.

[0013]

SUMMARY OF THE INVENTION Therefore, in the present invention, the above-mentioned object has a fixing rotating body which is in contact with an unfixed developer image and a pressure rotating body which is in pressure contact with the fixing rotating body. A fixing device provided with a plurality of image gloss modes in which a recording material carrying an unfixed developer image is nipped and conveyed between both rotating bodies to be heated and fixed, and the glossiness of an output image can be switched by changing a temperature control target value. In the above, it is achieved by changing the winding amount of the cleaning web based on the change of conditions such as the temperature control target value of the fixing device.

According to a first aspect of the present application, a fixing roller containing a heat source, a pressure roller arranged so as to be in pressure contact with the fixing roller, and a temperature of the fixing roller surface or the pressure roller surface are controlled. A temperature detecting element for detecting, and a temperature control means for maintaining the surface temperature of the fixing roller or the pressure roller at a predetermined temperature based on the temperature detected by the temperature detecting element,
The fixing roller and the pressure roller are provided with oil applying means for applying oil as a release agent to the surface of the fixing roller, and a cleaning web for contacting the fixing roller after fixing operation to remove offset toner. The unfixed developer image is fixed on the recording material by sandwiching and transporting the recording material carrying the multi-colored multi-layered or mono-colored unfixed developer image at the pressure contact portion of the output image by changing the temperature control target value. In a fixing device having a plurality of image gloss modes capable of switching the glossiness, the winding amount of the cleaning web is changed based on the temperature control target value of the fixing device.

A second aspect of the present invention is characterized in that, when the temperature adjustment target value is higher than the normal target value, the winding amount of the cleaning web is made larger than the standard amount.

A third aspect of the present invention is characterized in that when the temperature control target value is lower than the normal target value, the winding amount of the cleaning web is smaller than the standard amount.

A fourth aspect of the present invention is characterized in that the temperature control target value can be changed according to the type of recording material and the winding amount of the cleaning web is changed.

A fifth aspect of the present invention relates to a fixing roller containing a heat source, a pressure roller arranged so as to be in pressure contact with the fixing roller, and the temperature of the fixing roller surface or the pressure roller surface. A temperature detecting element for detecting, and a temperature control means for maintaining the surface temperature of the fixing roller or the pressure roller at a predetermined temperature based on the temperature detected by the temperature detecting element,
The fixing roller and the pressure roller are provided with oil applying means for applying oil as a release agent to the surface of the fixing roller, and a cleaning web for contacting the fixing roller after fixing operation to remove offset toner. In the fixing device for fixing the unfixed developer image on the recording material by sandwiching and transporting the recording material carrying the multi-colored multi-layered or mono-colored unfixed developer image at the pressure contact portion of When fixing a recording material carrying an image, the winding amount of the cleaning web is smaller than the standard amount.

According to a sixth aspect of the present invention, the fixing roller containing a heat source, the pressure roller arranged so as to be in pressure contact with the fixing roller, and the temperature of the fixing roller surface or the pressure roller surface are controlled. A temperature detecting element for detecting, and a temperature control means for maintaining the surface temperature of the fixing roller or the pressure roller at a predetermined temperature based on the temperature detected by the temperature detecting element,
The fixing roller and the pressure roller are provided with oil applying means for applying oil as a release agent to the surface of the fixing roller, and a cleaning web for contacting the fixing roller after fixing operation to remove offset toner. The unfixed developer image is fixed on the recording material by sandwiching and transporting the recording material carrying the multi-colored multi-layered or mono-colored unfixed developer image at the pressure contact part, and the gloss of the output image is changed by changing the fixing speed. In a fixing device provided with a plurality of image gloss modes capable of switching the degree, the winding amount of the cleaning web is changed based on the temperature control target value of the fixing device.

[0020]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

<First Embodiment> First, a first embodiment of the present invention.
Will be described based on FIG. 1 and FIG. FIG. 1 is a configuration diagram for explaining the first embodiment of the present invention.

In FIG. 1, reference numeral 1 is a fixing roller, and a pressure roller 2 is brought into pressure contact with the fixing roller 1 to form a nip portion between the fixing roller 1 and the fixing roller 1 so as to be driven and rotated. The fixing roller 1 is in the form of a hollow cylinder, and a halogen heater 3 is built in the hollow space to supply heat required for fixing. The pressure roller 2 is heated by the halogen heater 3 '. To control the temperature of the roller, the thermistor 4 as a temperature detecting element or the thermistor 4'as the pressure roller 2 is placed in contact with the paper non-passage area of the fixing roller 1 and the surface temperature of the roller is changed by the resistance value change according to the detected temperature. Is detected and the control device (CPU 20) delays the on / off timing of the halogen heater 3 by 200 ms with respect to the halogen heater 3'to set the roller surface temperature to a predetermined value and to reduce the inrush current. We are in control.

An oil application roller 12 is disposed in contact with the surface of the fixing roller 1, and the oil application roller 12 is contact-rotated to apply oil. Contact is made to apply during fixing, and separation is performed to prevent oil dripping during non-fixing. In the apparatus of the present embodiment as described above, the unfixed recording material is guided by the guide 8 and enters the nip portion from the right side, and is subjected to pressure and heat by the surface of the fixing roller 1 on which the uniform oil layer is formed,
After fixing, the sheet is guided by the guide 8'and discharged. The surface of the fixing roller 1 that has been fixed is rubbed against the cleaning web 7 again during the rotation, so that the offset toner is removed and oil is applied at the same time, while excess oil is stripped off. Reference numeral 9 is a separation claw for fixing the recording material and the pressure roller 2.

The fixing roller 1 has a structure in which an elastic layer of several tens of μm or more is provided on the core shaft of aluminum or the like in order to follow the thickness (several to several tens of μm) of the multicolor toner of a color image of four to four colors. is required. If the elasticity is low, the resolution is lowered due to the unfixed toner concave portion and the collapse of the toner. The material of the elastic layer is preferably a methyl- or methylvinyl-based liquid silicone rubber RTV or LTV type because it has elasticity. In particular, RTV has a high affinity with silicone oil and is easy to apply oil. So good. The above-mentioned RTV or LTV may be used as the surface layer, and a heat-resistant HTV layer may be provided below the surface layer to form a multilayer structure in which heat deterioration and peeling of the back surface of the surface layer are prevented. In this embodiment, an HTV type of dimethyl silicone rubber that is an elastic layer is provided on an aluminum cored bar with a thickness of 1.5 mm, and an LTV type of the same rubber that is a release layer is provided with a thickness of 250 μ.
It was molded into m and used. In addition, it is also possible to use methylphenyl silicone rubber.

Since the pressure roller 2 may have a smaller elasticity than the fixing roller 1, the pressure roller 2 can be simplified and a layer of HTV, fluororubber or the like may be provided on the aluminum core shaft, and PFA or PTFE may be provided on the surface. It may be coated to prevent oil swelling. Alternatively, RTV may be used. Of course, a roller having substantially the same configuration as the fixing roller may be used. In this embodiment, as a pressure roller, an HTV type of dimethyl silicone rubber is provided on a cored bar of 1.75 mm,
An LTV type of the same rubber having 250 μ provided thereon was molded into a diameter of 40 mm and used. As the rubber of the fixing roller and the pressure roller, methylphenyl silicone rubber may be used instead.

Regarding the material of the oil, as an example, methyl phenyl silicone oil K manufactured by Shin-Etsu Chemical Co., Ltd.
F-54 (containing 25 mol% of phenyl groups) was used. The content of the phenyl group is preferably 5 mol% or more from the viewpoint of preventing swelling. Further, if the viscosity is too low, the swelling property becomes large, and the contamination in the machine due to volatilization becomes worse. Conversely, if it is too high, the familiarity with the roller becomes poor. KF-54 in this embodiment is 400 cs.

As the toner, the sharp melt toner used in the color copying machine CLC-200 manufactured by Canon Sales Co., Ltd. was used. The fixing temperature is within a range of 120 to 180 ° C and the ripple is within ± 3 °. When outputting an image with strong gloss, the fixing temperature is + 10 ° C, and when outputting an image with weak gloss, the fixing temperature is the normal temperature. -10
° C. The roller peripheral speed was in the range of 10 to 120 mm / sec.

As for the oil supply section, an oil tank 18 which is a replaceable oil container is connected to the oil pump 16 via joints 17 and 17 'by a tube of silicone resin or the like. The structure of the oil tank 18 has oil contained in an aluminum pack in a rigid case. The structure of the joints 17 and 17 'is composed of a combination of rubber seals, springs, etc.
When 8 is detached, oil seals from both sides are made. The oil pump 16 has an oil replenishment nozzle 1 for applying oil.
Serves to send to 3. On the other hand, the oil remaining in the application section is once collected from the oil case 15 into the oil tank 18 and reused.

As for the type of pump, it is preferable to use a method of controlling the amount of oil with a pulse signal using an electromagnetic pump. Also, the use of a gear pump may be inexpensive. The pump may be provided with a check valve. Since the oil supply unit is a completely closed system and has no fear of leakage, it can be provided on the apparatus main body side or on the fixing unit side.

Regarding the oil application section, the oil sent from the oil replenishing nozzle 13 is a plate for holding a minute amount of the replenished oil which is in close proximity or in close proximity to the oil application roller 12 having silicone rubber as a surface layer. 1
4, the oil is held between the oil applying roller 12 and the oil applying roller 12 only for a short period of time, and the oil applying blade 11 regulates the amount of oil as the oil applying roller 12 rotates. A homogeneous thin layer coating is made on top. The surplus oil drops from the plate 14 for oil, travels along the bottom surface of the oil case 15 and is recovered and supplied again by the oil pump 16. Therefore, only a very small amount of oil always exists in the oil case 15. Even if the unit itself tilts or falls when separated from the main body, oil leakage to the outside hardly occurs. Of course, there is no oil leakage with respect to the inclination caused by the movement of the body when the body is attached.

In this embodiment, an LTV type of dimethyl silicone rubber, which is an elastic layer having a good releasability for toner, is provided on an aluminum cored bar as a coating roller, and molded to have an outer diameter of 25.1 mm. Then, an experiment was performed by changing the product hardness (Asker C) of the coating roller itself by changing the thickness of the elastic layer. The result at this time will be described in detail later. In addition, as the material of the elastic layer of the coating roller, methylphenyl silicone rubber can be used. Further, at this time, as the coating blade 11, a Zinc-coated steel plate integrally molded with fluororubber and having an R-shaped edge portion contacting the coating roller is used. On the other hand, they were brought into contact with each other at a set angle of about 15 ° at a total pressure of about 1 to 2 kg.

The oil applying roller 12 is used to fix the fixing roller 1.
The oil applied on the top of the fixing roller 1 absorbs or adheres to the paper as the paper passes, and goes out of the machine. The cleaning blade 5 adheres to and transfers to the roller 2.
As a result, the paper dust and toner are scraped off from the pressure roller 2, fall below the cleaning blade 5, and are immediately absorbed by the oil absorber 10 in the oil pan 6 which is a waste oil recovery container. , There is no risk of oil leakage when the unit is tilted or falls.

The material of the cleaning blade 5 is preferably made of fluororubber or the like which has excellent releasability and non-sticking property. The material of the oil absorber 10 is preferably one that absorbs oil mainly by a capillary phenomenon of a natural or natural fiber body or a porous body. For example, it is preferable that fibers having a diameter of several to ten and several μm, such as polyester, polypropylene, and polyethylene, are laminated to have a thickness of several cm or less and processed into a non-woven fabric. The surface may be subjected to a treatment for increasing lipophilicity. Among commercially available products, there are relatively inexpensive oil-dedicated absorbers such as "Wosep" (Toray) and "Powersorb" (3M). Another possible method is to solidify the oil by a chemical change, and an oil pan 6 having an oil absorber 10 built-in.
Can be detached and replaced from the fixing unit.

FIG. 2 shows the relationship between the surface temperature T of the fixing roller 1 (normal temperature is 170 ° C.), the glossiness (gloss value) of the image after fixing, and the offset amount. As the gloss measurement method, a method of measuring the amount of reflected light in the 60 ° direction was used. As a method of measuring the offset amount, a method of visually observing the toner accumulated on the cleaning web with the usual winding amount of the cleaning web was used. In FIG. 2, since the toner layer thickness is thick during full color printing, the smoothness is increased and the gloss value is apparently increased (in FIG. 2, A is full color gloss, B is black toner gloss, C is full color offset, and D is D). Black toner offset).

The gloss value and the visually preferable area are different between the full color printing and the black and white printing as described above and are based on the subjective evaluation. Therefore, it is difficult to express them uniquely, but in the full color printing. In the case of 1., a high gloss value can be obtained at a fixing temperature of about 180 ° C. and an image with strong gloss can be output, but the offset amount is 1.
It is 5 to 2 times. Then, in a range where low-temperature offset does not occur, a low gloss value is obtained when the fixing temperature is about 160 ° C., and an image with weak gloss can be output, but the offset amount is 0.7 to 0.8 times the normal temperature. It has become.
On the other hand, the offset amount remains the same during black-and-white printing, and when the gloss value exceeds 20, it gives an unfavorable impression as a normal document, and when it is 15 or less, it becomes a level that is not noticeable.

Therefore, if the winding amount of the cleaning web is switched according to the offset amount, the offset toner can be collected without accumulating a large amount of toner on the cleaning web. Further, since the cleaning roller can be efficiently wound up without scraping the fixing roller, it is possible to extend the life of the fixing device. Therefore, when outputting a highly glossy image, the winding amount of the cleaning web is set to the normal winding amount (for example, 0.45 mm / 7 sheets when the regular paper is passed, which is the winding amount, and 0.45 m when the OHT is passed).
m / 3.5 sheets), and when outputting an image with weak gloss, switch to 0.7 to 0.8 times the normal amount, and the offset amount at the normal fixing temperature. The same amount was obtained, and a good print image was obtained without the offset toner slipping through the cleaning web. The switching control of the winding amount is performed by the solenoid 21 receiving a signal from the CPU 20 to pull the cleaning web.

<Second Embodiment> Next, a second embodiment of the present invention.
Will be described. The same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the first embodiment, the method of changing the winding amount of the cleaning web by changing the glossiness is adopted. However, in the present embodiment, the cleaning web is changed only when the discrimination signal from the image signal processing circuit is a black image. It was decided to reduce the winding amount of.

In black and white printing, the gloss value is 2
When it exceeds 0, it gives an unfavorable impression as a normal document, and when it is 15 or less, it is a level that is not noticeable. Therefore,
160 before the cold offset occurs at the fixing temperature
Since the temperature can be lowered to about 0 ° C., the winding amount of the cleaning web can be increased to 0.7 to 0.8 times the normal amount, so that the life of the cleaning web can be extended.

<Third Embodiment> Next, a third embodiment of the present invention.
Will be described with reference to FIG. The same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

When fixing an OHT (Overhead Transparency) sheet, the rotation of the fixing roller is generally made slower than when fixing plain paper to improve the fixing property in many cases.

OHT with respect to the surface temperature T of the fixing roller 1
FIG. 3 shows the relationship between the offset amount and the offset amount of plain paper. In this case, since the OHT does not need to switch the glossiness, the fixing temperature is fixed, but the offset amount is larger than that of plain paper because the fixing speed is slow. Therefore, with the usual winding amount of the cleaning web, the offset toner cannot be collected and slips off, and a good printed image cannot be obtained. Therefore, when fixing the OHT sheet, the winding amount of the cleaning web may be set to be larger than usual. It is also possible to obtain the effect of switching the glossiness of plain paper by switching the fixing speed.

<Fourth Embodiment> Next, a fourth embodiment of the present invention.
Will be described with reference to FIG. The same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

When fixing recording materials having different thicknesses, in general, the fixing temperature is often switched in order to obtain a uniform glossiness.

FIG. 3 shows the relationship between the surface temperature T of the fixing roller 1 and the offset amount of the different paper thickness (64 g, 80 g, 105 g paper). In this case, when the thick paper is detected by the paper thickness detection means, the fixing temperature is set to a high temperature, and when the thin paper is detected, the fixing temperature is set to a low temperature. Offset amount decreases. Therefore, if the winding amount of the cleaning web is larger than usual at the time of detecting thick paper and the winding amount of the cleaning web is smaller than usual at the time of detecting thin paper, a good print image can be obtained.

In the above description, the embodiment in which the toner is multi-transferred onto the recording material has been described, but the present invention can be carried out in exactly the same manner even when an intermediate recording material or other transfer means is used. It goes without saying that you can.

[0047]

As described above, according to the present invention, by switching the winding amount of the cleaning web on the basis of the temperature control target value of the fixing roller, the cleaning toner does not slip off the offset toner from the cleaning web. It has become possible to wind up efficiently. Further, it was possible to prevent rubbing against the fixing roller due to the offset toner accumulated on the cleaning web and wrapping caused by sticking to the fixing roller when the fixing roller is cold.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a first embodiment device of the present invention.

FIG. 2 is a diagram showing a relationship between a gloss level after fixing and an offset amount with respect to a surface temperature of a fixing roller in the apparatus shown in FIG.

FIG. 3 is a diagram showing an offset amount of OHT and plain paper with respect to a surface temperature of a fixing roller in an apparatus according to a third embodiment of the present invention.

FIG. 4 is a diagram showing an offset amount of a paper thickness difference with respect to a surface temperature T of a fixing roller in an apparatus according to a fourth embodiment of the present invention.

FIG. 5 is a diagram showing a schematic configuration of a fixing device in a conventional image forming apparatus.

FIG. 6 is a diagram showing structures of a fixing roller and a pressure roller in the apparatus shown in FIG.

[Explanation of symbols]

1 ... Fixing roller 2 ... Pressure roller 3,3 '... Halogen heater 4,4' ... Thermistor 5 ... Cleaning blade 6 ... Oil pan 7 ... Cleaning web 8,8 '... Guide 9 ... Separating claw 10 ... Oil absorber 11 ... Oil application blade 12 ... Oil application roller 12a ... Oil 12b ... Surface layer 12c ... Aluminum core metal 13 ... Oil supply nozzle 14 ... Oil storage plate 15 ... Oil case 16,16 '... Oil pump 17,17' ...
Joint 18 ... Oil tank

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihiko Ochiai 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (6)

[Claims] 1. A fixing roller containing a heat source, a pressure roller arranged in pressure contact with the fixing roller, a temperature detecting element for detecting the temperature of the fixing roller surface or the pressure roller surface, Temperature control means for maintaining the surface temperature of the fixing roller or pressure roller at a predetermined temperature based on the temperature detected by the temperature detecting element, oil applying means for applying oil as a release agent to the fixing roller surface, and fixing operation. A recording material having a cleaning web for contacting the fixing roller which has been completed to remove the offset toner, and carrying a multicolor multi-layered or single color unfixed developer image at the pressure contact portion between the fixing roller and the pressure roller. The unfixed developer image is fixed on the recording material by nipping and conveying the sheet, and the glossiness of the output image can be switched by changing the temperature control target value. A fixing device provided with a card, wherein the winding amount of the cleaning web is changed based on a temperature control target value of the fixing device. 2. The fixing device according to claim 1, wherein when the temperature control target value is higher than the normal target value, the winding amount of the cleaning web is made larger than the standard amount. 3. The fixing device according to claim 1, wherein when the temperature control target value is lower than the normal target value, the winding amount of the cleaning web is set smaller than the standard amount. 4. The fixing device according to claim 1, wherein the temperature control target value can be changed according to the type of the recording material, and the winding amount of the cleaning web is changed. 5. A fixing roller containing a heat source, a pressure roller arranged in pressure contact with the fixing roller, a temperature detecting element for detecting the temperature of the fixing roller surface or the pressure roller surface, and Temperature control means for maintaining the surface temperature of the fixing roller or pressure roller at a predetermined temperature based on the temperature detected by the temperature detecting element, oil applying means for applying oil as a release agent to the fixing roller surface, and fixing operation. A recording material having a cleaning web for contacting the fixing roller which has been completed to remove the offset toner, and carrying a multicolor multi-layered or single color unfixed developer image at the pressure contact portion between the fixing roller and the pressure roller. In a fixing device for fixing the unfixed developer image on the recording material by sandwiching and transporting the recording material, when fixing the recording material carrying the single-color unfixed developer image, A fixing device characterized in that the winding amount of the cleaning web is smaller than the standard amount. 6. A fixing roller containing a heat source, a pressure roller arranged so as to be in pressure contact with the fixing roller, a temperature detecting element for detecting the temperature of the fixing roller surface or the pressure roller surface, Temperature control means for maintaining the surface temperature of the fixing roller or pressure roller at a predetermined temperature based on the temperature detected by the temperature detecting element, oil applying means for applying oil as a release agent to the fixing roller surface, and fixing operation. A recording material having a cleaning web for contacting the fixing roller which has been completed to remove the offset toner, and carrying a multicolor multi-layered or single color unfixed developer image at the pressure contact portion between the fixing roller and the pressure roller. The unfixed developer image is fixed on the recording material by nipping and conveying the sheet, and a plurality of image gloss modes in which the glossiness of the output image can be switched by changing the fixing speed are provided. In the provided fixing device, the winding amount of the cleaning web is changed based on a temperature control target value of the fixing device.